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{{Short description|Marine VHF radio system}}
{{about|inland vessel transmission identification|aircraft identification system also called ATIS|Automatic terminal information service|the satellite TV protocol|Automatic Transmitter Identification System (television)}}
[[File:Maritime VHF Sailor RT144.JPG|thumb|Radio transmitter with a label indicating it will identify any transmisssions from it as coming from "PF7297" using the ATIS protocol]]
<ref name="ofcom-atis-faq" />The '''Automatic Transmitter Identification System''' ('''ATIS''') is a [[marine VHF radio]] system used and mandated on navigable inland [[waterway]]s in Europe for identifying the ship or vessel that made a radio transmission. The identity of the vessel is sent digitally immediately after the ship's radio operator has finished talking and releases their transceiver's [[push-to-talk]] button. This contrasts to the [[Automatic identification system]] (AIS) used globally on ships that transmit continuously. A short post-transmission message is sent by the radio with the vessel identity and is in the form of an encoded [[call sign]] or [[Maritime Mobile Service Identity]], starting with number "9" and the three country-specific [[maritime identification digits]].
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